ZyXEL Communications ZyWall USG20-VPN - Regular Expressions in Black or White List Entries; The Anti-Spam White List Screen

Chapter 28 Anti-Spam
USG20(W)-VPN Series User’s Guide
445
28.5.2 Regular Expressions in Black or White List Entries
The following applies for a black or white list entry based on an e-mail subject, e-mail address, or
e-mail header value.
• Use a question mark (?) to let a single character vary. For example, use “a?c” (without the
quotation marks) to specify abc, acc and so on.
• You can also use a wildcard (*). For example, if you configure *def.com, any e-mail address that
ends in def.com matches. So “mail.def.com” matches.
• The wildcard can be anywhere in the text string and you can use more than one wildcard. You
cannot use two wildcards side by side, there must be other characters between them.
• The USG checks the first header with the name you specified in the entry. So if the e-mail has
more than one “Received” header, the USG checks the first one.
28.6 The Anti-Spam White List Screen
Click Configuration > UTM Profile > Anti-Spam > Black/White List and then the White List
tab to display the Anti-Spam White List screen.
Configure the white list to identify legitimate e-mail. You can create white list entries based on the
sender’s or relay’s IP address or e-mail address. You can also create entries that check for
particular header fields and values or specific subject text.
Mail Header Field
Name
This field displays when you select the Mail Header type.
Type the name part of an e-mail header (the part that comes before the colon). Use up
to 63 ASCII characters.
For example, if you want the entry to check the “Received:” header for a specific mail
server’s domain, enter “Received” here.
Field Value
Keyword
This field displays when you select the Mail Header type.
Type the value part of an e-mail header (the part that comes after the colon). Use up to
63 ASCII characters.
For example, if you want the entry to check the “Received:” header for a specific mail
server’s domain, enter the mail server’s domain here.
See Section 28.5.2 on page 445 for more details.
OK Click OK to save your changes.
Cancel Click Cancel to exit this screen without saving your changes.
Table 173 Configuration > UTM Profile > Anti-Spam > Black/White List > Black/White List > Add
LABEL DESCRIPTION